| /* |
| * Copyright (c) 1995, 2003, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.awt.image; |
| |
| import java.util.Hashtable; |
| import java.io.InputStream; |
| import java.io.IOException; |
| import java.awt.image.*; |
| |
| public abstract class ImageDecoder { |
| InputStreamImageSource source; |
| InputStream input; |
| Thread feeder; |
| |
| protected boolean aborted; |
| protected boolean finished; |
| ImageConsumerQueue queue; |
| ImageDecoder next; |
| |
| public ImageDecoder(InputStreamImageSource src, InputStream is) { |
| source = src; |
| input = is; |
| feeder = Thread.currentThread(); |
| } |
| |
| public boolean isConsumer(ImageConsumer ic) { |
| return ImageConsumerQueue.isConsumer(queue, ic); |
| } |
| |
| public void removeConsumer(ImageConsumer ic) { |
| queue = ImageConsumerQueue.removeConsumer(queue, ic, false); |
| if (!finished && queue == null) { |
| abort(); |
| } |
| } |
| |
| protected ImageConsumerQueue nextConsumer(ImageConsumerQueue cq) { |
| synchronized (source) { |
| if (aborted) { |
| return null; |
| } |
| cq = ((cq == null) ? queue : cq.next); |
| while (cq != null) { |
| if (cq.interested) { |
| return cq; |
| } |
| cq = cq.next; |
| } |
| } |
| return null; |
| } |
| |
| protected int setDimensions(int w, int h) { |
| ImageConsumerQueue cq = null; |
| int count = 0; |
| while ((cq = nextConsumer(cq)) != null) { |
| cq.consumer.setDimensions(w, h); |
| count++; |
| } |
| return count; |
| } |
| |
| protected int setProperties(Hashtable props) { |
| ImageConsumerQueue cq = null; |
| int count = 0; |
| while ((cq = nextConsumer(cq)) != null) { |
| cq.consumer.setProperties(props); |
| count++; |
| } |
| return count; |
| } |
| |
| protected int setColorModel(ColorModel model) { |
| ImageConsumerQueue cq = null; |
| int count = 0; |
| while ((cq = nextConsumer(cq)) != null) { |
| cq.consumer.setColorModel(model); |
| count++; |
| } |
| return count; |
| } |
| |
| protected int setHints(int hints) { |
| ImageConsumerQueue cq = null; |
| int count = 0; |
| while ((cq = nextConsumer(cq)) != null) { |
| cq.consumer.setHints(hints); |
| count++; |
| } |
| return count; |
| } |
| |
| protected void headerComplete() { |
| feeder.setPriority(ImageFetcher.LOW_PRIORITY); |
| } |
| |
| protected int setPixels(int x, int y, int w, int h, ColorModel model, |
| byte pix[], int off, int scansize) { |
| source.latchConsumers(this); |
| ImageConsumerQueue cq = null; |
| int count = 0; |
| while ((cq = nextConsumer(cq)) != null) { |
| cq.consumer.setPixels(x, y, w, h, model, pix, off, scansize); |
| count++; |
| } |
| return count; |
| } |
| |
| protected int setPixels(int x, int y, int w, int h, ColorModel model, |
| int pix[], int off, int scansize) { |
| source.latchConsumers(this); |
| ImageConsumerQueue cq = null; |
| int count = 0; |
| while ((cq = nextConsumer(cq)) != null) { |
| cq.consumer.setPixels(x, y, w, h, model, pix, off, scansize); |
| count++; |
| } |
| return count; |
| } |
| |
| protected int imageComplete(int status, boolean done) { |
| source.latchConsumers(this); |
| if (done) { |
| finished = true; |
| source.doneDecoding(this); |
| } |
| ImageConsumerQueue cq = null; |
| int count = 0; |
| while ((cq = nextConsumer(cq)) != null) { |
| cq.consumer.imageComplete(status); |
| count++; |
| } |
| return count; |
| } |
| |
| public abstract void produceImage() throws IOException, |
| ImageFormatException; |
| |
| public void abort() { |
| aborted = true; |
| source.doneDecoding(this); |
| close(); |
| java.security.AccessController.doPrivileged( |
| new java.security.PrivilegedAction() { |
| public Object run() { |
| feeder.interrupt(); |
| return null; |
| } |
| }); |
| } |
| |
| public synchronized void close() { |
| if (input != null) { |
| try { |
| input.close(); |
| } catch (IOException e) { |
| } |
| } |
| } |
| } |